Steven Moffat and Mark Gatiss are going to join forces again – but not for a new series of Sherlock.

Doctor Who showrunner Moffat, who co-created Sherlock with Gatiss, told Radio Times that the pair are working on a new show previously approved by the BBC.

"I've got a few ideas that I really like," he explained. "There was one script I actually had greenlit by the BBC before Doctor Who and Sherlock came along... it needs a massive re-write but I still really like it, I might have another go at that.

"Obviously Mark [Gatiss] and me, we can't have a conversation without inventing some sort of TV series and we've got a notion we might like to do...

"And I'd like to write a play because it would be so completely different. My main enthusiasm though is just to be at the beginning of something as opposed to well into it," he added.

"I'm aware that I've lived through my highlights," he continued. "I'm never going to top being the guy who does Doctor Who and Sherlock at the same time. I'm not sure I even want to, it's an amazing thing."